coffee and l carnitine can you mix with Mushroom Coffee with L Carnitine, Coconut Oil, & Grass Green Coffee L-Carnitine - 90caps.
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I have been taking other supplements for this issue for a couple of years without good results

[PubMed: 9853827] 22

1,2,6,18 The recommended laboratory evaluation for patients with suspected vitamin B 12 deficiency includes a complete blood count and serum vitamin B 12 level

10.1016/j.tem.2008.11.001 Trends Endocrinol
